Red110 Posted January 16, 2021 Share Posted January 16, 2021 Hello all. As part of my 90´s conversion from 200 Tdi to 4.0, we removed the original undersea fuel tank and fitted another in the back, from a 90 Td4. The problem is that the proper fuel pump for a Defender 4.0, ESR3928, is way too long for that tank, maybe 4 inches in excess. I thought that the tanks for NAS, 50 Ann, Td5 and Td4 would be all about the same. But this not seems to be the case Any advise on this? Can I fit another pump without affecting the petrol output and the ECU readings? Can the pump just be shortened in some way? Changing the tank would be a nightmare, now that everything´s already in its place underneath the vehicle Thanks in advance Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 16, 2021 Share Posted January 16, 2021 You can normally quite easily shorten pumps, either through cutting and welding, or making up a joining bracket between two shorter pieces. Without seeing the pump you have, tricky to know. Level sender's, if on a wire, can be bent so they at least give a proper empty warning, but perhaps read full for a while. Or, you shorten them, so give a reasonable scale, but more prone innaccuracies, i think. Quote Link to comment Share on other sites More sharing options...
Red110 Posted January 17, 2021 Author Share Posted January 17, 2021 Thanks so much for your answer, Bowie. Shortening the pump may be the only solution, although I am really not sure how to do it Anybody knows if I could use a Td4 pump for fueling a 4.0?? Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted January 17, 2021 Share Posted January 17, 2021 A Freelander pump ? Mo Quote Link to comment Share on other sites More sharing options...
Red110 Posted January 17, 2021 Author Share Posted January 17, 2021 A Defender Puma one. The tank came from that vehicle, so... 🙄 Really puzzles me that the tanks of some 90s post-Tdi might be different. But I can´t think of any other explanation. Or maybe only NAS & 50 Ann´s are different? What do people usually do pump wise when swapping from 90 Td5 to V8?? Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted January 17, 2021 Share Posted January 17, 2021 The Puma ‘pump’ is not actually a pump, just a fuel level sender and pickup. Td5s have a pump, but it’s a two-stage one and not straightforward to adapt to other engines (apparently - I’ve never tried). Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted January 17, 2021 Share Posted January 17, 2021 The reason I asked Red110 is that the TD4 engine was only fitted to the Freelander. The Ford Transit engine is not a TD4 🥴 Mo 1 Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 17, 2021 Share Posted January 17, 2021 Is it a GEMS or Thor 4.0 lump, because the earlier GEMS style on can use a stock classic in-tank pump which is fairly easily adapted. Quote Link to comment Share on other sites More sharing options...
Eightpot Posted January 17, 2021 Share Posted January 17, 2021 The same tank/pump is used in the 2.8i M52 Defender - I presume it needs a similar 3.5 bar output. Dont see why you couldn't use a conventional diesel tank to use the level sender then suck the fuel up with a facet pump. Quote Link to comment Share on other sites More sharing options...
Red110 Posted January 18, 2021 Author Share Posted January 18, 2021 Mo: Right, the reason for having named the Puma "Td4" is because here in Spain we always name so any post-Td5 Defender, I don´t know why. FF: It is a GEMS engine. So I guess the best way to go would be to adapt the new pump, ESR3928 Thanks Retroanaconda and Eightpot for your answers. BTW, next task will be swapping the Tdi dash to Td5 style,, wonderful mod 😉🙂 Quote Link to comment Share on other sites More sharing options...
Eightpot Posted January 19, 2021 Share Posted January 19, 2021 I'm not sure modifying the esr3928 is the best way, it's an expensive pump and can be difficult to find- I'd check the length on a 3.9 efi pump first Quote Link to comment Share on other sites More sharing options...
Eightpot Posted January 19, 2021 Share Posted January 19, 2021 (edited) Strange - was walking past the scrap bin this morning and an esr3928 was sticking out! Photo compared to a 300tdi sender. It would be easy to shorten it - just compress the spring and use pins through the tube at the required length. Theres no reason the pump couldn't be moved from underneath to the side to shorten it also. I'd still look at modifying a cheaper one first maybe though? Edited January 19, 2021 by Eightpot Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 19, 2021 Share Posted January 19, 2021 Given the earlier lumps have a standard feed - regulator - return setup almost any EFi pump that fits in the hole would do, it just wants to be something of similar or greater HP. Or, as said, you can use a plain pickup pipe and an external universal pump/pumps. 1 Quote Link to comment Share on other sites More sharing options...
Red110 Posted January 19, 2021 Author Share Posted January 19, 2021 Amazing, Eightpot! 🙂🙂 I´ll try to modify it, because I´ve already bought it. That´s how I know it´s way too long 🙄 Just in case, which is the reference for a 3.9 pump? Fridge Freezer, would a universal pump go fine with the ECU? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 19, 2021 Share Posted January 19, 2021 2 hours ago, Red110 said: Fridge Freezer, would a universal pump go fine with the ECU? The ECU knows nothing about the pump, as long as it can hit the flow/pressure required it will work. Most EFI pumps will hit 100PSI if you clamp the return - the injector pressure is regulated by the pressure regulator on the fuel rail. Quote Link to comment Share on other sites More sharing options...
Red110 Posted January 20, 2021 Author Share Posted January 20, 2021 Thanks so much :):) Quote Link to comment Share on other sites More sharing options...
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